X-Message-Number: 16797
From: "Trygve Bauge" <>
Subject: Dewars and electrical freezers
Date: Mon, 2 Jul 2001 02:06:08 +0200

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>>Trygve said:

>> Or having someone in Europe build a smaller 1 or 2 person dewar, as
>> suggested by
>> D. den Otter.

>D. den Otter responded:

>Actually, that's not quite what I suggested. I've attached (parts of)
>the relevant posts below.


Trygves response: What I refered to was the following paragraph in a letter from
den Otter:

>I think that electric cryogenic freezers (see previous
>post) or locally bought smaller dewars would be a
>better idea. The boiloff in smaller dewars can be
>somewhat compensated with better insulation and by
>using a closed system, where LN2 is automatically
>added from the supply tank(s) to the storage unit by
>means of a simple lever system. Such systems can be
>either bought off-the-shelf, or could be designed by
>some people I know. It's safer, too.

I know that den Otter prefers electrical freezers for storage of heads,

but in my post I was refering to what he wrote about smaller dewars, still large
enough to store whole bodies in. (Or at least that is what I understood these 
to be.)

Sincerely,

Trygve Bauge


Ps. As to head storage in electrical freezers. Anyone that has seen an 
electrical home food freezer thaw out due to electrical failure or a brown or 
black out, will likely tend to feel safer about a huge liquid nitrogen tank that
don't need electricity and don't have to be refilled for several weeks.  There 
are fewer mobile parts in a cryotank, than in any electrical freezer,

and the backup systems are simpler: e.g. another dewar, while an electrical 
freezer is dependent upon a backup generator and a backup supply of LN2 or dry 
ice.

And as to the dewar being damaged in transit. One can buy insurance that covers 
any damage that occurs in transit.


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